Actually you will get videos from youtube.
for example you can view a video. The link is https://youtube.com/xyz
if you want that video just you will add "ss" before the youtube.com (https://ssyoutube.com/xyz)
Then you will get the video with the mentioned quality.
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I've been searching for good facebook and twetter video downloaders recently and found some. The easies I've discovered are those two http://fb-keepvid.com and http://tw-keepvid.com What do you use to get video from this media? Pls share